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Date: Sun, 01 Jul 2012 10:49:03 +0200
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To: user@cassandra.apache.org
Subject: Re: High CPU usage as of 8pm eastern time
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Thank you for the mail. Same here, but I restarted the affected server 
before I noticed your mail.

It affected both OpenJDK Java 6  (packaged with Ubuntu 10.04) and Oracle 
Java 7 processes. Ubuntu 32 bit servers had no issues, only a 64 bit 
machine.

Likely it is related to the leap second introduced today.

On 2012.07.01. 5:11, Mina Naguib wrote:
> Hi folks
>
> Our cassandra (and other java-based apps) started experiencing extremely high CPU usage as of 8pm eastern time (midnight UTC).
>
> The issue appears to be related to specific versions of java + linux + ntpd
>
> There are many solutions floating around on IRC, twitter, stackexchange, LKML.
>
> The simplest one that worked for us is simply to run this command on each affected machine:
>
> date; date `date +"%m%d%H%M%C%y.%S"`; date;
>
> CPU drop was instantaneous - there was no need to restart the server, ntpd, or any of the affected JVMs.
>
>
>
>